684008089 has 8 divisors (see below), whose sum is σ = 699519240. Its totient is φ = 668593536.

The previous prime is 684008077. The next prime is 684008099. The reversal of 684008089 is 980800486.

It can be written as a sum of positive squares in 4 ways, for example, as 229977225 + 454030864 = 15165^2 + 21308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684008089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684008069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9732 + ... + 38245.

It is an arithmetic number, because the mean of its divisors is an integer number (87439905).

Almost surely, 2^684008089 is an apocalyptic number.

It is an amenable number.

684008089 is a deficient number, since it is larger than the sum of its proper divisors (15511151).

684008089 is a wasteful number, since it uses less digits than its factorization.

684008089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48299.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 684008089 is about 26153.5483061094. The cubic root of 684008089 is about 881.0902847284.

The spelling of 684008089 in words is "six hundred eighty-four million, eight thousand, eighty-nine".